When body and soul have been broken by a prolonged painful struggle, there comes a crisis when a strong nature braces itself for greater effort
 Honoré de Balzac, Lost Illusions (1843). copy citation

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Author Honoré de Balzac
Source Lost Illusions
Topic struggle effort
Date 1843
Language English
Reference
Note Translated by Ellen Marriage
Weblink https://www.gutenberg.org/cache/epub/13159/pg13159.html

Context

“"The very same," said Lucien. "He is a queer kind of father, he is!" Courtois continued. "He is worth two hundred thousand francs and more, without counting his money-box, and he has sold his son up, they say." When body and soul have been broken by a prolonged painful struggle, there comes a crisis when a strong nature braces itself for greater effort; but those who give way under the strain either die or sink into unconsciousness like death. That hour of crisis had struck for Lucien; at the vague rumor of the catastrophe that had befallen David he seemed almost ready to succumb.” source